any warranty or insurance that you may have on it.
It's also highly likely that having admitted to throwing it "a couple of times" has resulted in some form of internal damage.
Put your big boy pants on and take it to whomever has the warranty on it and have it checked out.
I have an iPhone 5c that I have had in a life proof case. I've thrown it a couple of times and it had gotten no damage to it's outside. One day it had about 10% battery life left and it died on me way sooner than it should have and has not turned back on since. I tried to charge it in an outlet with no luck and have tried to plug it into my laptop to see if it is recognized and still no luck. I can use the manufacturer warranty but they will charge me for a new phone if there is internal damage. I can use the insurance too but I did not want to. Is it likely that there is damage on the inside? I feel like there is some way to check but I don't want to open up the phone on my own.